From type and printing historian Stephen Saxe:
Job printing—a nineteenth-century term—is traditionally defined as printing that uses display type and no more than a sheet or two of paper. Short as that definition is, it encompasses a world of paper items—tickets, letterheads, notices, invoices, vouchers, coupons, cards, labels, posters, receipts, and timetables, to name only a very few.
The people and companies responsible for producing a piece of job work typically design it too, executing the whole job for an external client. This was especially the case in the letterpress era when the distinction between printer and designer was less prominent.
See also: Ephemera